33CC GAS Motor Bicycle 4-Stroke Engine Kit Motorized Bike EPA FS Bicycle Motors DIY ELECTRIC BIKE 38CC 4-Stroke Engine Kit. This kit Fit Conversion 24 inch, 26 inch bike. Top Speed of 30 to 40 MPH (Depending On Various Factors)Gas Mileage : 100-150 MPG (miles per gallon). easy to use, excellent performance and compatibility advantages of ordinary bicycles and motorcycles, and light and flexible. good comfort, low noise, foot dual powe,security and reliability.